Windows server 2012 Data Center with VDI configuration error message ( The remote session was disconnected because there are no remote desktop license servers available)

Dears,
I have two windows server 2012 Data Center and I configured (Virtual Desktop Interface)VDI on it's.
All my clients connected on both of servers by used Remote Desktop sessions ,5 months since.
Currently,when the clients is connected on the both of servers they received the following error:
"The remote session was disconnected because there are no remote desktop license servers available to provide license"
Kindly note, I installed windows Licenses Server Data Center on the both of servers. 
Regards.

Hi,
Please let us know if you have purchased RDS CALs and install it in your RD licensing server.
Also, on RD Session host servers, please make sure that you have specified the license mode and point them to the RD licensing server.
Remote Desktop Services Client Access Licenses (RDS CALs)
http://technet.microsoft.com/en-us/library/cc753650.aspx
RD Licensing Configuration on Windows Server 2012
http://blogs.technet.com/b/askperf/archive/2013/09/20/rd-licensing-configuration-on-windows-server-2012.aspx
Hope this helps.
Jeremy Wu
TechNet Community Support

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